Re: [PATCH net-next v2 2/9] dt-bindings: net: lan9645x: add LAN9645X switch bindings

[Jakub Kicinski <kuba@kernel.org>]

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---
dt-bindings: net: lan9645x: add LAN9645X switch bindings

Add bindings for LAN9645X switch. We use a fallback compatible for the
smallest SKU microchip,lan96455s-switch.

> diff --git a/Documentation/devicetree/bindings/net/dsa/microchip,lan96455s-switch.yaml b/Documentation/devicetree/bindings/net/dsa/microchip,lan96455s-switch.yaml
> new file mode 100644
> index 000000000000..0282e25c05d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/dsa/microchip,lan96455s-switch.yaml

[ ... ]

> +patternProperties:
> +  "^(ethernet-)?ports$":
> +    type: object
> +    additionalProperties: true
> +    patternProperties:
> +      "^(ethernet-)?port@[0-8]$":

Does having additionalProperties set to true bypass the port number
restriction?

Since dsa.yaml allows port@[0-9a-f]+, it seems port@9 would silently pass
validation as an additional property. Should this be unevaluatedProperties
set to false instead?

> +        type: object
> +        description: Ethernet switch ports
> +
> +        $ref: dsa-port.yaml#
> +
> +        properties:
> +          rx-internal-delay-ps:
> +            const: 2000
> +
> +          tx-internal-delay-ps:
> +            const: 2000

Does enforcing a 2000ps delay conflict with standard rgmii bindings?

As documented in net/ethernet-controller.yaml, a full 2ns delay is
typically modeled using phy-mode set to rgmii-id rather than hardcoding the
delay properties with a base rgmii mode.

[ ... ]

> +required:
> +  - compatible
> +  - reg
> +
> +unevaluatedProperties: false

How are the five integrated 10/100/1000Base-T phys mentioned in the
description modeled?

Since unevaluatedProperties is false at the top level and there is no
definition or reference for an mdio node, wouldn't adding an mdio subnode
to configure these phys fail schema validation?

Should there be a reference to /schemas/net/mdio.yaml#?